Carnegie Mellon just broke 800 students' hearts.

Anybody who's gone through the tedious and seriously scary process of applying to your first choice college knows all about the nearly crippling anxiety that follows when waiting for your acceptance (or rejection) letters. Luckily, that agonizing feeling is usually followed up by the ecstatic feeling you get after you get your acceptance—AKA, the feeling of a massive weight being lifted off your shoulders.

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Well, 800 applicants to Carnegie Mellon University's graduate computer science program experienced that feeling on Monday when they received emails notifying them they'd been accepted to the prestigious Pennsylvania university, only to get that feeling snatched away in a second email saying their acceptance emails were sent by mistake and they were actually rejected.

Ben Leibowitz, a student who received an acceptance email by mistake, had already told his whole family about his acceptance before learning of the mistake. "Now I have to clean up the mess. I'm calling all my relatives, I'm going, `I'm sorry it's not happening,'" he told The Huffington Post of the awkward and heartbreaking mess-up.

Kenneth Walters, a spokesman from Carnegie Mellon, said the university is going to conduct a review of their acceptance email generation process to prevent this error from happening again and he apologized to the students who received false acceptance letters, saying, "We understand the disappointment created by this mistake." But it's understandably little consolation to the hundreds of students who got the chance to attend their dream school dangled in front of them, only to have it snatched away.

Carnegie Mellon isn't the first school to send out hundreds of acceptance letters by mistake—John Hopkins University did the same thing last December.

High school seniors message to colleges everywhere: Take-backs are not cool, so get it together before you click send on those acceptance emails!

Can you believe how many students received acceptance letters by mistake? What would you do in this situation? Sound off in the comments below!